[ee122] DNS over TCP

Ofer Sadgat ofer at berkeley.edu
Wed Oct 17 01:58:53 PDT 2007

I've read on the internet that you can issue a DNS request over a TCP
connection. I have generated valid DNS data (equivalent to the data that
wireshark picks up for DNS packets with the exception of the ID field which
I have set to 0x0101) and connected to a DNS server on port 53 and
transmitted the data. The problem is that I don't get a response. Maybe the
framing is wrong?


I've read that public hotspots use DNS to exclude people from using the
internet. Isnt this a bad idea because people will still be able to go to
sites which their browser might have cached the ip for?




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